In this equation, there are 3 CI atoms that are present on the product side as well as 1 CI atom present on the reactant side. Now, add a coefficient of 3 in HCI. Then, there will be 3 H atoms on the reactant side as well as 2 H atoms on the product side. Further, 6 CI atoms on the reactant side and 3 atoms on the product side will be present. Add a coefficient of 2 in AICI3. Afterwards, there will be 1 AI on the reactant side and 2 AI on the product side. Then, add a coefficient in AI on the reactant side. Here’s the balanced chemical equation :
2Al(s)+6HCl(aq)→2AlCl3(aq)+3H2(g)